Fix bug where project topics truncate

What does this MR do?

This MR fixes a bug where project labels are incorrectly truncated.

The tooltip was previously displayed when hovering over any label and included the text of all labels. This has now been changed to show the text of a truncated label when hovering over one, and to show the text of the hidden labels when hovering over the '+ more' text.

normal label hover	truncated label hover	+ more hover

What are the relevant issue numbers?

Closes #57788 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the style guides